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我县第一造纸厂一台SHF13-10型沸腾燃烧蒸汽锅炉,1991年先后两次发生埋管上集箱爆裂事故,不得不停炉进行修理。该炉沸腾段为竖式埋管结构,埋管上下集箱都是由φ219×8mm的20~#无缝钢管制成,埋管中水吸热蒸发后汇于上集箱,再由导气管送入锅炉上锅筒之间。自1989年10月投用以来,运行状况良好,未发生过问题。1991年9月23日,右侧埋管上集箱从靠近炉墙一端裂开,未认真进行原因分析即挖补修理后继续投用。仅仅刚过一个月,右侧上集箱也发生开裂,停炉后进入炉膛中检查,发现裂口长约50mm、宽2-3mm,集箱本体其他部位无明显变形。覆盖在集箱上面的混凝土防
First County Paper Mill SHF13-10 type of a boil-off steam boiler, in 1991 twice on the tube burst on the header, had to shut down for repairs. The boiling section of the boiler is a vertical buried pipe structure. The upper and lower headers of the pipe are made of 20 ~ # seamless steel tubes with φ219 × 8mm. The buried pipe absorbs heat and evaporates, and then is collected in the upper header. Into the boiler on the drum between. Since its commissioning in October 1989, it has been operating in good condition and no problems have occurred. On September 23, 1991, the upper header of the buried pipe on the right was cracked from one end near the furnace wall, and the cause analysis was not conscientiously carried out after digging and repairing. Just over a month, the right side of the header also cracking occurred after the furnace into the furnace check and found that the crack length of about 50mm, width 2-3mm, no significant deformation of the other parts of the header body. Covering the top of the box to prevent concrete